JTextPane - 如何设置所选文本的样式

Question

I am looking for the most simple way to control JTextPane (its inner text) font color and font size within selected text only.

I know I must look at StyledDocument but its snippets show the JMenu action listener tricks but not JButton :(

I couldn't find code snippets which could show how to change selected text style by JButton clicked (the actionPerformed(...) method) etc :(

I mean something in this direction

• A) I have a text in JTextPane lets say "My home is to turn into borabora and this is..."
• B) Text "borabora" is selected in JTextPane
• C) JButton("size=16") was clicked
• D) Text "borabora" size becomes 16

I couldn't find this kind of snippets so I need your advice.

Any useful comment is appreciated

Answer 1

In your actionPerformed method of the applicable jbutton you could run this. (modify as needed.)

String text = jTextPane.getSelectedText();
int cursorPosition = jTextPane.getCaretPosition();

StyleContext context = new StyleContext();
Style style;

jTextPane.replaceSelection("");

style = context.addStyle("mystyle", null);
style.addAttribute(StyleConstants.FontSize, new Integer(16));
jTextPane.getStyledDocument().insertString(cursorPosition - text.length(), text, style);

Answer 2

but its snippets show the JMenu action listener tricks but not JButton

You can add an Action to a JButton as well as well as a JMenu. For example:

Jbutton button = new JButton( new StyledEditorKit.FontSizeAction("16", 16) );

You would use Styles when you want to apply multiple properies at one time to a piece of text.

Answer 3

Based on @scartag answer and the comment about the API (from @kleopatra), I have found another way to do it.

StyleContext context = new StyleContext();
Style style = context.addStyle("mystyle", null);
style.addAttribute(StyleConstants.FontSize, new Integer(16));;
jTextPane.setCharacterAttributes(style , true);

The method setCharacterAttributes(style, replace) changes the style of the selected text so you don't need to remove it and add again with a new style. And more, the boolean replace indicates if the style replaces the old style ( true ) or if is added to the old style ( false ).